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Fig. 13. The hearts of Protopterus (a) and Neoceratodus (b). The ventricle and bulbus cordis are cut to show the internal structure (ventral view). LA, left part of the atrium; P, pericardium; RA, right part of the atrium; RVLF, right ventrolateral folds; SV, spiral valve; V, ventricle. Reprinted and modified with permission of John Wiley & Sons, Inc. from Journal of Morphology, 190, Burggren and Johansen, Circulation and respiration in lungfishes (dipnoi), 217–236, Fig. 3, © 1986, Wiley-Liss, Inc., a Wiley Company.

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